Maturation divishion in F1 hybrids between 5 species in Dinkel group and Triticum Timopheevi Zhuk

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概要

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• As a part of the basic investigations on the breeding of leaf-rust resistant varieties of wheats by artificial hybridization interspecific or intergeneric, the crossabilities between 5 species in Dinkel group and Triticum Timopheevi and the behaviour of chromosomes in F1 hybrids between them were studied. Five species in Dinkel group used as female parents were as follows:1) Triticum vulgare erythrospermum. 2) Triticum compactum, 3) Triticum Spelta Duhamelianum. 4) Triticum sphaerococcum ubiginosum, 5) Triticum Macha.Judging their crossabilities with T. Timopheevi from the percentage of hybrids matured to the number of florets pollinated, T. Spelta is considerably fertile, T. compactum is next, the rests being in order of T. sphaerococcum, T. Macha and T. vulgare.At MI in meiosis of PMC's of these F1 plants, far more univalents were observed in every cross combination than in the usual wheat pentaploid hybrids with Emmer species, and correspondingly the number of bivalents to be met with decreased conspicuously, and yet more than half of the bivalents formed was open bivalents with loose pairing at one end.The multivalent chromosomes were often observed, sometimes up to quinquivalent indifferent combinations, above all, trivalents being frequently met with.Herewith, it is especially to be emphasized that the basic chromosome configuration, 14II+7I has never been observed through whole combinations.Laggards and bridges were frequently observed in anaphase of both 1st and 2nd divisions. Dyads or polyads were not observed, but pollen tetrads normal in shape with many micronuclei were formed considerable frequently. The shape of spikes in F1s resembled more closely to vulgare type in every combination, and the anthers did not dehise in general, although rarely some spikes produced grains a little in free conditions.The pollen fertility was very lower, resulted in the complete sterility by selfing except the F1s of T. Spelta×T. Timopheevi, which showed about 1 percent fertility. But from all these F1 plants, the backcrossed seeds were obtained with their parents respectively.

• 日本遺伝学会の論文

著者

• 渡辺 好郎

  農林省東北農業試験場盛岡試験地

• 百足 幸一郎

  農林省東北農業試験場盛岡試験地

関連論文

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• Triticum Timopheevi × Triticum vulgareより得たるF_1の成熟分裂,形態及び稔性について
• Maturation divishion in F1 hybrids between 5 species in Dinkel group and Triticum Timopheevi Zhuk
• CYTOGENTICAL STUDIES ON THE BACKCROSSED PLANTS BETWEEN F1 HYBRIDS (T. Timopheevi×T. vugare) AND THEER PARENTS
• Cytogenetical studies on the intergeneric hybrids between Triticum and Agropyron:I. The meiotic behaviour and the morphology of F1 hybrids between Triticum vulgare Vill. and Agropyron glaucum Roem. et Schult

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